Bottle cap



FIG. 1 is a perspective view of a bottle cap, embodying our new design;

FIG. 2 is a front view thereof, back view is omitted for being identical with the front view;

FIG. 3 is a left side view thereof, right side view is omitted for being identical with the left view;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom view thereof.

The broken lines in the drawings are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a bottle cap, as shown and described. 